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View of the air sampling tower at the Mauna Loa Observatory or MLO. MLO is located on the north flank of the Mauna Loa Volcano at an altitude of 11,135 feet above sea level and has been continuously monitering and collecting data related to climate change, atmospheric composition and airquality since the 1950's. MLO's location situates it in a prime spot for sampling the Earth's background air in the well mixed free troposphere. Today, the observatory is best known for its measurements of rising anthropognic carbon dioxide concentrations in the atmosphere. This trend is sometimes referred to as the "Keeling Curve". A one hour, five minute long exposure produces star trails, or circular paths of the stars around the celestial poles due to the earths rotation. (130 separate exposures of 30 seconds duration each are stitched together in this frame).